When the quantity q is greater than zero, __________ is added to the system?
1 answer:
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Answer:
The force exerted by the floor is 80 N.
Explanation:
Given that,
Mass of ball = 0.5 kg
Velocity= 4 m/s
Time t = 0.05 s
When the ball rebounds then the kinetic energy is
Where, m = mass of ball
v = velocity of ball
Put the value into the formula
The average force exerted by the floor on the ball = change in kinetic energy over collision time
Hence, The force exerted by the floor is 80 N.
Answer:
2. decreasing the distance of the space shuttle from Earth
Explanation:
To increase the gravitational force on a space shuttle, it is a good thing to decrease the distance of the space shuttle from the earth.
This is based on the Newton's law of universal gravitation which states that "the gravitational force between two bodies is a directly proportional to the product of their masses and inversely proportional to the square of the distance between them".
Mathematically;
F =
G is the universal gravitation constant, it cannot be changed
m is the mass of the body
r is the distance
Since the distance is inversely proportional, is we reduce it, the value of the gravitational force will increase.